It is an organic compound ( a group ) of which the most commonly known is heme, the pigment that gives blood its red color. Word (prophyrin) comes from Greek word for purple, relates to their deep color.
Heme is cofactor in protein hemoglobin.
see the haemoglobin in the blood is a coordination complex of Fe3+(iron) and prophyrin .. ... when iron is found in the form of free radicle then it corrodes by oxidation and hence rusts .. iron in blood cant rust